Norma has an a-frame cabin. the back is shown below. how many square feet of paint will she need to cover the back of the cabin?

I FOUND YOUR FULL QUESTION IN OTHER FUENETES.
 PLEASE SEE ATTACHED IMAGE. 
 For this case what you should do is find the area of the triangle which will be given by:
 A = (1/2) * (b) * (h)
 Where
 b: base
 h: height
 Substituting the values we have:
 A = (1/2) * (25 1/2) * (15)
 A = 191.25 feet ^ 2
 
 she will need 191.25 feet ^ 2 to cover the back of the cabin